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Takafumi Yano, Satoshi Tanabe, Kenji Ishido, Mizutomo Azuma, Takuya Wada, Mizuto Suzuki, Natsuko Kawanishi, Sakiko Yamane, Tohru Sasaki, Chikatoshi Katada, Tetsuo Mikami, Natsuya Katada, Wasaburo Koizumi 
World J Gastrointest Endosc 8(8):368-373. Published online Apr 25, 2016. doi: 10.4253/wjge.v8.i8.368
Mitsuaki Morimoto, Koji Koinuma, Alan K Lefor, Hisanaga Horie, Homare Ito, Naohiro Sata, Yoshikazu Hayashi, Keijiro Sunada, Hironori Yamamoto 
World J Gastrointest Endosc 8(8):374-377. Published online Apr 25, 2016. doi: 10.4253/wjge.v8.i8.374